Globio
Glossopedia: Species
A species is defined as a single kind of animal, plant or creature. Examples of different species are given and how the many species that exist relate to biodiversity. Scientific naming conventions are introduced.
The Franklin Institute
The Franklin Institute: Living Things Families
What do centipedes and crabs have in common? What's so special about a backbone? Check this site out from The Franklin Institute if you are interested in biology and classification.
Estrella Mountain Community College
Online Biology Book: The Nature of Science and Biology
Use the scientific reasoning and critical thinking to take an in-depth look at the basics of biology.